| 摘要 |
PCT No. PCT/NL95/00337 Sec. 371 Date Apr. 3, 1997 Sec. 102(e) Date Apr. 3, 1997 PCT Filed Oct. 5, 1995 PCT Pub. No. WO96/11075 PCT Pub. Date Apr. 18, 1996The invention relates to a method of making nipple holes or similar holes in a double-walled wheel rim having an inner wall positioned radially inward and outside of that an outer wall. The holes are made by punching by means of a punching tool provided with a cutting edge whereby the cutting edge is moved successively through the outer wall and the inner wall of the wheel rim and a punch die supporting the inner wall. The invention encompasses also an apparatus for the application of this method.
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